We bought this to use for an event where we had people play a game of ours in a public space. The purpose it served to prevent anyone from trying to steal the iPad was very successful, though no one really tried.

Putting the ipad in was easy enough, the directions were fairly clear, though I did put it in upside down the first time (easily recognized that it was the wrong way). Then when locking it up the key fit in the lock ok with a bit of movement pushing inwards. It hits a point when inserting the key where it really seems like its all the way in there; but it's not you have to jiggle it left and right and make sure its in there all the way.

When unlocking it at the end of our event it was a huge pain, took me several tries to get this thing unlocked.